Gas sensing performance of α-, α/β-, and β-Ga2O3 polymorphs

Nyepudzai C. Gatsi; Murendeni I. Nemufulwi; Gugu H. Mhlongo; Nosipho Moloto; Rudolph M. Erasmus; Elizabeth Coetsee; Hendrik C. Swart; Odireleng M. Ntwaeaborwa

doi:10.1016/j.materresbull.2025.113583

Gas sensing performance of α-, α/β-, and β-Ga₂O₃ polymorphs

Nyepudzai C. Gatsi, Murendeni I. Nemufulwi, Gugu H. Mhlongo, Nosipho Moloto, Rudolph M. Erasmus, Elizabeth Coetsee, Hendrik C. Swart, Odireleng M. Ntwaeaborwa

Research output: Contribution to journal › Article › peer-review

Abstract

This paper reports the detection of SO₂, NH₃, and CO gases using Ga₂O₃ polymorphs. The α-Ga₂O₃, α/β-Ga₂O₃, and β-Ga₂O₃ sensing materials were prepared using the hydrothermal method, followed by calcination at different temperatures ranging from 550 °C to 950 °C. The gas sensing properties were measured and analyzed based on the polymorphism-induced physicochemical properties of the sensing materials. Different Ga₂O₃ polymorphs showed distinct sensing properties, and factors contributing to this preferential gas detection behavior are discussed in detail. The proposed gas sensing mechanisms were discussed. Notably, the gas sensing performance of the α/β-Ga₂O₃-based sensor is reported here for the first time.

Original language	English
Article number	113583
Journal	Materials Research Bulletin
Volume	192
DOIs	https://doi.org/10.1016/j.materresbull.2025.113583
Publication status	Published - Dec 2025
Externally published	Yes

Keywords

Gallium oxide
Gas sensing
Nanowires
Polymorph

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1016/j.materresbull.2025.113583

Cite this

@article{6b1cc826927f44ca844e7c642f317904,

title = "Gas sensing performance of α-, α/β-, and β-Ga2O3 polymorphs",

abstract = "This paper reports the detection of SO2, NH3, and CO gases using Ga2O3 polymorphs. The α-Ga2O3, α/β-Ga2O3, and β-Ga2O3 sensing materials were prepared using the hydrothermal method, followed by calcination at different temperatures ranging from 550 °C to 950 °C. The gas sensing properties were measured and analyzed based on the polymorphism-induced physicochemical properties of the sensing materials. Different Ga2O3 polymorphs showed distinct sensing properties, and factors contributing to this preferential gas detection behavior are discussed in detail. The proposed gas sensing mechanisms were discussed. Notably, the gas sensing performance of the α/β-Ga2O3-based sensor is reported here for the first time.",

keywords = "Gallium oxide, Gas sensing, Nanowires, Polymorph",

author = "Gatsi, {Nyepudzai C.} and Nemufulwi, {Murendeni I.} and Mhlongo, {Gugu H.} and Nosipho Moloto and Erasmus, {Rudolph M.} and Elizabeth Coetsee and Swart, {Hendrik C.} and Ntwaeaborwa, {Odireleng M.}",

note = "Publisher Copyright: {\textcopyright} 2025 The Author(s)",

year = "2025",

month = dec,

doi = "10.1016/j.materresbull.2025.113583",

language = "English",

volume = "192",

journal = "Materials Research Bulletin",

issn = "0025-5408",

publisher = "Elsevier Ltd.",

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TY - JOUR

T1 - Gas sensing performance of α-, α/β-, and β-Ga2O3 polymorphs

AU - Gatsi, Nyepudzai C.

AU - Nemufulwi, Murendeni I.

AU - Mhlongo, Gugu H.

AU - Moloto, Nosipho

AU - Erasmus, Rudolph M.

AU - Coetsee, Elizabeth

AU - Swart, Hendrik C.

AU - Ntwaeaborwa, Odireleng M.

PY - 2025/12

Y1 - 2025/12

N2 - This paper reports the detection of SO2, NH3, and CO gases using Ga2O3 polymorphs. The α-Ga2O3, α/β-Ga2O3, and β-Ga2O3 sensing materials were prepared using the hydrothermal method, followed by calcination at different temperatures ranging from 550 °C to 950 °C. The gas sensing properties were measured and analyzed based on the polymorphism-induced physicochemical properties of the sensing materials. Different Ga2O3 polymorphs showed distinct sensing properties, and factors contributing to this preferential gas detection behavior are discussed in detail. The proposed gas sensing mechanisms were discussed. Notably, the gas sensing performance of the α/β-Ga2O3-based sensor is reported here for the first time.

AB - This paper reports the detection of SO2, NH3, and CO gases using Ga2O3 polymorphs. The α-Ga2O3, α/β-Ga2O3, and β-Ga2O3 sensing materials were prepared using the hydrothermal method, followed by calcination at different temperatures ranging from 550 °C to 950 °C. The gas sensing properties were measured and analyzed based on the polymorphism-induced physicochemical properties of the sensing materials. Different Ga2O3 polymorphs showed distinct sensing properties, and factors contributing to this preferential gas detection behavior are discussed in detail. The proposed gas sensing mechanisms were discussed. Notably, the gas sensing performance of the α/β-Ga2O3-based sensor is reported here for the first time.

KW - Gallium oxide

KW - Gas sensing

KW - Nanowires

KW - Polymorph

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DO - 10.1016/j.materresbull.2025.113583

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